Steam generator



Jan. 20, 1942. BlERSACK 2,270,704

STEAM GENERATOR Filed Oct. 16, 1939 Imus/Li a)".- Ji l c/zcz-rczfBah/"$6252 Patented Jan. 20, 1942 UNITED STATES STEAM GENERATOR RichardBiersack, Berlin-Wilmersdorf, Germany, assignor to Patentverwertungs-Gesellschaft mit beschrankter Haftung Hermes, Berlin, Germany, acorporation of Germany Application October 16, 1939, Serial No. 299,780In Germany July 28, 19-38 3 Claims.

This invention relates to a steam generator of the tubular type in whichthe temperature is regulated by injecting water into the superheater.

In the copending application Serial No. 289,514, filed August 11, 1939,is described a steam generator, particularly a steam generator withforced passage of the operating medium in which the temperature isregulated by injecting water into the superheater and in which thesuperheater is divided, at the point where the water injection occurs,into two sections between which is inserted a cold lying heatingsurface. The additional heating surface is thus disposed in a zone wherethe temperature is lower than that prevailing in the zone containing thesuperheater.

The object of the present invention is to improve such an arrangement;the additional or auxiliary heating surface or conduit is disposedaccording to the invention in the same heating zone as the last part ofthe heating surface provided for the evaporation.

In the accompanying drawing is shown an arrangement according to theinvention in diagrammatic form.

Referring to the drawing, the steam generator which is heated by afurnace l is subdivided by an intermediate wall 2 into a radiation part3 and a contact part 4. The hot gases flow from the radiation part intothe contact part in the direction as indicated by the arrows 5. Theoperating fluid is supplied by a pump 6 to the economizer l lying in theradiation part and then to the heating surface 8 which constitutes thefirst part of the evaporator.

After the operating fluid has flown through this heating surface part itreaches the second zone of evaporation or the second part of theevaporator in which the temperature is lower and where it is completelyconverted into steam and slightly superheated in the heating surfacepart II). The temperature of the operating medium is then increased inthe superheater section II.

Behind this section is inserted a device l3 for regulating thetemperature by injection of water. The water injection conduit isdenoted by the reference numeral I9. The final superheating of theoperating fluid is effected in the superheater section l2. Theadditional heating surface or conduit inserted as disclosed in the abovecopending application between the superheater sections II and I2 isarranged according to the present invention substantially in the sameheating zone as the evaporator section 9, i. e., in the last zone ofevaporation. The advantage of such an arrangement consists in providingapproximately the same heat conditions in the heating surface part as inthe heating surface part 9, so that the advantages resulting from thearrangement of the heating surface part 9 are also present in theauxiliary heating surface I5.

An impulse control [4 is provided for the wa.- ter injection control.This control includes a thermostatic device for regulating the operationof a valve indicated in the drawing between the conduit l9 and thedevice I3.

In controlling a steam generator with forced passage of the operatingfluid it is preferable to employ a quantity measuring device [8 and toinsert the latter between the pump and pipe system, in which case alsocontrol impulses for the quantity of water supplied may also be derivedfrom the quantity measuring device. In such an arrangement the injectionwater may be branched off behind the quantity measuring device, viewedin the direction of fiow of the operating fluid, as shown by the line L!connected at point 2|.

The quantity measuring device I6 may be associated with a static diskll. The operating medium supplied by the pump flows through the deviceI1, and the quantity passing through this device is measured andindicated by the meter Hi.

What is claimed is:

1. A steam generator system comprising a first heating zone subjected toa relatively high temperature, a second heating zone subjected to atemperature which is lower than that obtaining in said first zone, anevaporator composed of a plurality of serially related sections with thelast section thereof wherein evaporation of residual Water takes placedisposed within said second heating zone, a superheater disposed withinsaid first heating zone and serially connected with said last section ofthe evaporator, a device for injecting water into steam leaving saidsuperheater to control the temperature of the steam supplied thereby,and an auxiliary heating section connected with said device andreceiving .said injection water, said auxiliary heating section beingdisposed within said second heating zone and subjected therein totemperature conditions which are substantially identical to those actingupon said last section of the evaporator.

2. The generator system and structure defined in claim 1, together witha pump for supplying water to said system to be converted into steamtherein, a measuring device disposed between said pump and said systemto control the amount of water supplied thereto, and a conduit connectedbetween said measuring device and said system for supplying water tosaid injection device.

3. The generator system and structure defined in claim 1, wherein saidsuperheater comprises two separate sections both disposed within saidfirst heating zone, and wherein said water injection device and saidauxiliary heating section are serially connected between the twosections of the superheater.

RICHARD BIERSACK.

